/* =========================================================
   BB体育 · /assets/site.css
   看台式命令栏 + 纵向叙事长卷 · 共享外壳与通用组件
   ========================================================= */

:root {
  /* 色彩 */
  --ink: #0B0D0C;
  --chalk: #F4F5F1;
  --concrete-dark: #232725;
  --concrete-mid: #6E7470;
  --mist: #C9CEC9;
  --pitch: #1F7A4D;
  --pitch-deep: #0E3B28;
  --signal: #FF5A1F;
  --whistle: #FFD23F;
  --paper: #FFFFFF;

  /* 排版 */
  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Heiti SC", Arial, sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Heiti SC", system-ui, -apple-system, Arial, sans-serif;
  --font-mono: "IBM Plex Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  /* 结构 */
  --wrap: 1240px;
  --gutter: clamp(16px, 4vw, 48px);
  --line: 1px solid var(--mist);
}

/* ---------- reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--chalk);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg, video { max-width: 100%; display: block; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; }

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.12;
}

h1 { font-size: clamp(2.125rem, 7vw, 6.5rem); }
h2 { font-size: clamp(1.75rem, 4.5vw, 3.5rem); }
h3 { font-size: clamp(1.25rem, 2.4vw, 1.75rem); }
h4 { font-size: 1.0625rem; }

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }
ul, ol { margin: 0 0 1em; padding-left: 1.2em; }

hr { border: 0; }

#main-content { display: block; scroll-margin-top: 132px; }

/* ---------- 焦点反馈：哨声黄内圈 + 信号橙外环 ---------- */
:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px var(--whistle);
}

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 300;
  transform: translateY(-200%);
  padding: 10px 18px;
  background: var(--whistle);
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 14px;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: transform 0.15s ease;
  box-shadow: 0 0 0 2px var(--signal);
}
.skip-link:focus { transform: translateY(0); }

/* ---------- 通用工具 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.mono {
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* =========================================================
   HEADER
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--ink);
  color: var(--chalk);
  border-bottom: 2px solid var(--pitch);
}

.header-stripe {
  height: 4px;
  background:
    linear-gradient(
      90deg,
      var(--pitch) 0 34%,
      var(--whistle) 34% 37%,
      var(--signal) 37% 41%,
      var(--concrete-dark) 41% 100%
    );
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: clamp(8px, 2vw, 28px);
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 10px var(--gutter);
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  padding: 4px 0;
  color: var(--chalk);
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  background: var(--whistle);
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: -0.04em;
  line-height: 1;
  clip-path: polygon(0 0, 100% 0, 100% 74%, 74% 100%, 0 100%);
  transition: background-color 0.15s ease, color 0.15s ease;
}

.brand:hover .brand-mark {
  background: var(--signal);
  color: var(--chalk);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: 0.02em;
}

.brand-tagline {
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--mist);
}

/* 移动菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 9px 13px;
  background: transparent;
  color: var(--chalk);
  border: 1px solid rgba(201, 206, 201, 0.34);
  border-radius: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease, background-color 0.15s ease;
}
.nav-toggle:hover,
.nav-toggle[aria-expanded="true"] {
  color: var(--ink);
  background: var(--whistle);
  border-color: var(--whistle);
}

.nav-toggle-bars {
  display: grid;
  gap: 3px;
  width: 16px;
}
.nav-toggle-bars span {
  display: block;
  height: 2px;
  background: currentColor;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }
.nav-toggle-bars span { transition: transform 0.15s ease, opacity 0.15s ease; }

/* 主导航 */
.primary-nav { margin-left: auto; }

.nav-list {
  display: flex;
  align-items: stretch;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-item { display: flex; }

.nav-link {
  display: flex;
  align-items: baseline;
  gap: 6px;
  padding: 12px clamp(8px, 1vw, 14px);
  color: var(--chalk);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--concrete-mid);
  transition: color 0.15s ease;
}

.nav-link:hover { color: var(--whistle); border-bottom-color: var(--whistle); }
.nav-link:hover .nav-index { color: var(--whistle); }

.nav-link[aria-current="page"] {
  color: var(--signal);
  border-bottom-color: var(--signal);
}
.nav-link[aria-current="page"] .nav-index { color: var(--signal); }

/* 状态带 */
.header-status {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px clamp(16px, 4vw, 48px);
  padding-inline: calc(max(0px, (100vw - var(--wrap)) / 2) + var(--gutter));
  background: var(--concrete-dark);
  border-top: 1px solid rgba(201, 206, 201, 0.14);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--mist);
  overflow: hidden;
}

.status-dot {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--whistle);
  box-shadow: 0 0 0 3px rgba(255, 210, 63, 0.18);
}

.status-text {
  flex: 1 1 auto;
  margin: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.status-hint {
  flex: 0 0 auto;
  color: var(--concrete-mid);
  letter-spacing: 0.04em;
}

.kbd {
  display: inline-block;
  min-width: 1.5em;
  padding: 0 4px;
  background: rgba(244, 245, 241, 0.1);
  border: 1px solid rgba(201, 206, 201, 0.32);
  color: var(--chalk);
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1.6;
  text-align: center;
}

/* 滚动进度（由 site.js 注入） */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  z-index: 5;
  background: transparent;
  pointer-events: none;
}
.scroll-progress-bar {
  display: block;
  height: 100%;
  width: 0;
  background: var(--signal);
}

/* =========================================================
   FOOTER
   ========================================================= */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 112px);
  background: var(--ink);
  color: var(--chalk);
  border-top: 4px solid var(--pitch);
  overflow: hidden;
}

.footer-bleacher {
  height: 20px;
  background: repeating-linear-gradient(
    135deg,
    var(--concrete-dark) 0 14px,
    transparent 14px 28px
  );
  border-bottom: 1px solid rgba(201, 206, 201, 0.14);
}

.footer-inner {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: clamp(32px, 5vw, 64px) var(--gutter) 0;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr);
  gap: clamp(24px, 4vw, 64px);
  padding-bottom: clamp(24px, 3.4vw, 44px);
  border-bottom: 1px solid rgba(201, 206, 201, 0.16);
}

.footer-wordmark {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 3.4vw, 46px);
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--chalk);
}

.footer-summary {
  max-width: 34ch;
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.footer-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 3vw, 40px);
}

.footer-col-title {
  margin: 0 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(201, 206, 201, 0.2);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--whistle);
}

.footer-list {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-link {
  display: inline-block;
  padding: 6px 0;
  color: var(--chalk);
  font-size: 15px;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease, padding-left 0.15s ease;
}
.footer-link:hover {
  color: var(--whistle);
  border-bottom-color: var(--whistle);
  padding-left: 6px;
}

.footer-contact {
  padding: clamp(24px, 3.4vw, 40px) 0;
  border-bottom: 1px solid rgba(201, 206, 201, 0.16);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 20px clamp(20px, 4vw, 40px);
  align-items: start;
}

.contact-item { min-width: 0; }

.contact-label {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--concrete-mid);
}

.contact-value {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--chalk);
  overflow-wrap: break-word;
  word-break: break-word;
}

.footer-note {
  grid-column: 1 / -1;
  margin: 4px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--pitch);
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--concrete-mid);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 24px;
  padding: 18px 0 clamp(24px, 3vw, 32px);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-legal-link {
  font-size: 13px;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 206, 201, 0.35);
  padding-bottom: 1px;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.footer-legal-link:hover {
  color: var(--whistle);
  border-bottom-color: var(--whistle);
}

.footer-icp {
  margin: 0 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--concrete-mid);
}

/* =========================================================
   通用组件
   ========================================================= */

/* 面包屑 */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(18px, 3vw, 32px);
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--concrete-mid);
}
.breadcrumbs a {
  color: var(--concrete-mid);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.breadcrumbs a:hover {
  color: var(--ink);
  border-bottom-color: var(--signal);
}
.crumb-sep { color: var(--mist); }
.breadcrumbs [aria-current="page"] { color: var(--ink); }

/* 正文 */
.prose {
  max-width: 72ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink);
}
.prose > * + * { margin-top: 0; }
.prose h2 {
  margin: 2em 0 0.55em;
  font-size: clamp(24px, 3vw, 34px);
  padding-left: 14px;
  border-left: 4px solid var(--pitch);
}
.prose h3 { margin: 1.7em 0 0.5em; }
.prose h4 { margin: 1.5em 0 0.4em; font-size: 17px; }
.prose p { margin: 0 0 1.1em; }
.prose ul, .prose ol { margin: 0 0 1.2em; padding-left: 1.3em; }
.prose li { margin-bottom: 0.4em; }
.prose a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--signal);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
  transition: color 0.15s ease, background-color 0.15s ease;
}
.prose a:hover { color: var(--signal); background: rgba(255, 210, 63, 0.32); }
.prose strong { font-weight: 700; }
.prose blockquote {
  margin: 1.5em 0;
  padding: 16px 20px;
  border-left: 4px solid var(--pitch);
  background: var(--paper);
  font-weight: 500;
}
.prose code {
  padding: 1px 5px;
  background: var(--concrete-dark);
  color: var(--chalk);
  font-family: var(--font-mono);
  font-size: 0.9em;
}
.prose img { margin: 1.4em 0; border: var(--line); }

/* 网格 */
.grid { display: grid; gap: clamp(16px, 2.4vw, 28px); }
.grid-2 { display: grid; gap: clamp(16px, 2.4vw, 28px); grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { display: grid; gap: clamp(16px, 2.4vw, 28px); grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-12 { display: grid; gap: clamp(16px, 2.4vw, 28px); grid-template-columns: repeat(12, minmax(0, 1fr)); }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }

/* 章节头 */
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px 24px;
  margin-bottom: clamp(18px, 3vw, 32px);
  padding-bottom: 12px;
  border-bottom: 2px solid var(--ink);
}
.section-index {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--pitch);
}
.section-title {
  margin: 0;
  font-size: clamp(24px, 3.6vw, 40px);
}
.section-lede {
  max-width: 52ch;
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--concrete-dark);
}

/* 分隔线 */
.rule-line {
  height: 0;
  margin: clamp(24px, 4vw, 48px) 0;
  border: 0;
  border-top: 1px solid var(--mist);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border: 2px solid var(--ink);
  border-radius: 0;
  background: var(--ink);
  color: var(--chalk);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 15px;
  letter-spacing: 0.02em;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.15s ease, background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.btn:hover { transform: translateY(-2px); }

.btn-primary {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--ink);
}
.btn-primary:hover {
  background: var(--whistle);
  border-color: var(--whistle);
}

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--ink);
}
.btn-ghost:hover {
  background: var(--ink);
  color: var(--chalk);
}

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  background: var(--mist);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  line-height: 1.6;
}
.tag-pitch { background: var(--pitch); color: var(--paper); }
.tag-signal { background: var(--signal); color: var(--ink); }
.tag-whistle { background: var(--whistle); color: var(--ink); }

/* 研究板卡片 */
.panel {
  background: var(--paper);
  border: 1px solid var(--mist);
  border-top: 3px solid var(--ink);
  transition: transform 0.15s ease, border-top-color 0.15s ease, box-shadow 0.15s ease;
}
.panel:hover {
  transform: translateY(-2px);
  border-top-color: var(--signal);
  box-shadow: 0 6px 0 -3px var(--mist);
}
.panel-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 14px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--mist);
}
.panel-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: -0.01em;
}
.panel-body { padding: 18px; }

/* 数据带 */
.data-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  border: var(--line);
  border-top: 3px solid var(--pitch);
  background: var(--paper);
}
.data-cell {
  padding: 16px 18px;
  border-right: 1px solid var(--mist);
}
.data-cell:last-child { border-right: 0; }
.data-value {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.data-label {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--concrete-mid);
}

/* 图片容器（页面阶段放入 <img>） */
.media-frame {
  position: relative;
  overflow: hidden;
  background: var(--concrete-dark);
  border: var(--line);
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 16 / 10;
}
.media-frame.is-portrait img { aspect-ratio: 4 / 5; }
.media-frame.is-square img { aspect-ratio: 1 / 1; }
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(11, 13, 12, 0.3) 1px, transparent 1.2px);
  background-size: 6px 6px;
  opacity: 0.45;
}
.media-caption {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--concrete-mid);
}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width: 1024px) {
  .nav-toggle { display: inline-flex; }

  .primary-nav {
    flex-basis: 100%;
    margin-left: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.22s ease;
  }
  .primary-nav[data-open] {
    max-height: 70vh;
    overflow-y: auto;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    padding: 6px 0 12px;
    border-top: 1px solid rgba(201, 206, 201, 0.18);
  }
  .nav-item { width: 100%; }
  .nav-link {
    justify-content: flex-start;
    padding: 13px 4px;
    font-size: 15px;
    border-bottom: 1px solid rgba(201, 206, 201, 0.12);
  }
  .nav-link[aria-current="page"] {
    border-bottom-color: rgba(255, 90, 31, 0.42);
  }
  .nav-index { width: 26px; flex: 0 0 auto; }

  .status-hint { display: none; }
}

@media (max-width: 900px) {
  .footer-top { grid-template-columns: minmax(0, 1fr); }
  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .span-5, .span-6, .span-7, .span-8 { grid-column: span 6; }
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  body { font-size: 16px; line-height: 1.7; }
  .header-inner { padding-block: 8px; }
  .brand-mark { width: 36px; height: 36px; font-size: 15px; }
  .brand-tagline { display: none; }
  .header-status { font-size: 10.5px; }
  .footer-columns { grid-template-columns: minmax(0, 1fr); }
  .footer-icp { margin-left: 0; }
  .grid-2, .grid-3 { grid-template-columns: minmax(0, 1fr); }
  .data-cell { border-right: 0; border-bottom: 1px solid var(--mist); }
  .data-cell:last-child { border-bottom: 0; }
  .btn { width: 100%; }
}

@media (max-width: 560px) {
  .grid-12 { grid-template-columns: minmax(0, 1fr); }
  .span-5, .span-6, .span-7, .span-8, .span-12 { grid-column: auto; }
}

/* =========================================================
   可访问性：减少动态
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .panel:hover,
  .btn:hover { transform: none; }
}